Dark spooky tower defense game key art, a glowing magical stone tower on a hill in a haunted graveyard at midnight, ghostly translucent spirits with glowing blue eyes rising from cracked tombstones and crawling toward the tower, eerie purple and electric blue lighting, volumetric fog rolling across the ground, gnarled dead trees with twisted branches, full moon behind dark storm clouds, crows silhouetted in the sky, dramatic cinematic composition, painterly digital illustration, deep shadows, atmospheric horror fantasy, vertical portrait orientation